It is getting close to fall, ive also saw a lot of helicopters flying around lately, I assume they are looking for pot growers and whatnot, maybe not who knows. Also saw a few military choppers around the airport too up here, some are quieter than others ive also noticed.

Chances are it was either a UH-60M, their blade design helps cut down on rotor tip vortices which are the primary cause of the noise you hear from helicopters, or there is also the possibility that it is one of the new UH-72 Lakota's, they are super quiet and are a four blade system which also helps cut down the noise.

Chances are it was either a UH-60M, their blade design helps cut down on rotor tip vortices which are the primary cause of the noise you hear from helicopters, or there is also the possibility that it is one of the new UH-72 Lakota's, they are super quiet and are a four blade system which also helps cut down the noise.